No its not, the 1st 3 digits at least are wrong.
I think it should be A203 870 33 89 - and you need the glove compartment holder, screws, power and fibre cables.
However, there is often an accesory part number starting with B6 that can be cheaper than buying the Axxx part number
Theres description on how to fit CD changer into A class on www.mercupgrades.com
- part numbers are different but basics are same - may be of some use to you !
I think the parts you need are
1x CD changer (above)
2x most fibre cable (see my doc)
4x screws N000000 001955
1x power cable A203 540 32 34
1x glovebox braceket A203 820 07 14
1x screw for above A001 984 64 29
Of course i'll take it apart.
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Currently Modding: ML63 Rear Heated Seats
Recent Mods: ML63 - TV, DAB, Rear Seat entertainment Previous Mercs: W164 ML500, W163 ML500, W169 A180CDI, R230 SL55, W163 ML430, W208 CLK55, R129 SL500, W208 CLK320, R170 SLK230, 1st Merc = R129 SL320.